National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

81°F

27°C

Humidity 27%
Wind Speed E 12 mph
Barometer 30.08 in (1018.0 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 25 May 4:54 pm CDT
Extended Forecast for

Decatur Airport IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. East southeast wind 5 to 8 mph becoming calm after midnight.

    Low: 58 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 80. East wind 5 to 7 mph.

    High: 80 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Mostly cloudy, with a low around 62. East southeast wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 62 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind becoming east northeast 5 to 7 mph in the morning. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61. North northeast wind 5 to 8 mph.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 82. East northeast wind 10 to 14 mph, with gusts as high as 17 mph.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 59. East northeast wind 7 to 9 mph, with gusts as high as 15 mph.

    Low: 59 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 58. East southeast wind 5 to 8 mph becoming calm after midnight.
Tuesday
Increasing clouds, with a high near 80. East wind 5 to 7 mph.
Tuesday Night
A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Mostly cloudy, with a low around 62. East southeast wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind becoming east northeast 5 to 7 mph in the morning. Chance of precipitation is 40%.
Wednesday Night
Mostly clear, with a low around 61. North northeast wind 5 to 8 mph.
Thursday
Mostly sunny, with a high near 82. East northeast wind 10 to 14 mph, with gusts as high as 17 mph.
Thursday Night
Partly cloudy, with a low around 59. East northeast wind 7 to 9 mph, with gusts as high as 15 mph.
Friday
Partly sunny, with a high near 76.
Friday Night
Mostly cloudy, with a low around 57.
Saturday
Mostly sunny, with a high near 75.
Saturday Night
Partly cloudy, with a low around 56.
Sunday
Sunny, with a high near 76.
Sunday Night
Mostly clear, with a low around 55.
Monday
Sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
1:36 pm CDT May 25, 2026
Forecast Valid:
5pm CDT May 25, 2026-6pm CDT Jun 1, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation